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Analog Devices Inc. LT1307BCMS8#TRPBF
- Part No.:
- LT1307BCMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1307BCMS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,079
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Product details
Overview
LT1307BCMS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz PWM boost DC/DC converter optimized for single-cell alkaline/NiMH operation down to 1V input. It delivers up to 75mA at 3.3V or 50mA at 5V with 500mA internal NPN switch (VCESAT = 295mV @ 500mA), continuous switching at light loads, and integrated low-battery detection (200mV threshold). It targets space-constrained portable medical and communication devices requiring clean, ripple-free output.
For engineers reviewing the LT1307BCMS8#TRPBF datasheet, LT1307BCMS8#TRPBF pinout, LT1307BCMS8#TRPBF application, or LT1307BCMS8#TRPBF equivalent, key selection criteria include its 1mA quiescent current (vs. 50µA in LT1307), absence of Burst Mode ripple, 600kHz switching frequency enabling ceramic capacitor use, and MSOP-8 package compatibility with high-density PCB layouts.
Technical Context
The LT1307BCMS8#TRPBF implements a current-mode PWM architecture with fixed 600kHz oscillator and no hysteresis in the burst comparator-ensuring continuous switching across all load conditions. Its error amplifier features 25–65 µmhos transconductance and 30–100 V/V gain, compensated externally via the VC pin using a series RC network (e.g., 100kΩ + 680pF).
It integrates a 200mV precision low-battery detector (LBI/LBO pins) with open-collector output and 10µA sink capability, plus shutdown control (SHDN) requiring VIN-level enable. The internal 500mA NPN switch exhibits 295mV saturation voltage at 500mA and supports duty cycles up to 84%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 5V - enables direct operation from single-cell alkaline (0.92V min start) or NiMH batteries without pre-regulation. |
| Switching Frequency | 550–750kHz (typ. 600kHz) - allows use of small surface-mount ceramic capacitors (1µF input, 10µF output) and 10µH inductors. |
| Quiescent Current | 1.0–1.5mA (not switching) - defines baseline power draw in active regulation; higher than LT1307 but eliminates low-frequency ripple. |
| Feedback Voltage | 1.195–1.245V - sets output voltage via resistor divider (VOUT = 1.22V × (1 + R1/R2)); stable over –40°C to 85°C. |
| Switch VCESAT | 250–400mV @ 500mA - determines conduction loss and thermal rise; lower values improve efficiency at medium loads. |
| Low-Battery Threshold | 186–210mV on LBI pin - triggers LBO open-collector output to signal battery depletion; compatible with standard 1MΩ pull-up. |
| Shutdown Current | 1–3µA - ensures ultra-low system standby power when SHDN is grounded. |
Pinout & Package
LT1307BCMS8#TRPBF is housed in an 8-lead MSOP (MS8) package with 0.65mm lead pitch, 3mm × 3mm body, and exposed pad for thermal enhancement. Pin 1 is VC (compensation), Pin 2 is FB (feedback), Pin 3 is SHDN (shutdown), Pin 4 is GND, Pin 5 is SW (switch node), Pin 6 is VIN (input supply), Pin 7 is LBI (low-battery input), and Pin 8 is LBO (low-battery output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connect external RC (e.g., 100kΩ + 680pF) to ground; critical for loop stability and transient response tuning. |
| FB (Pin 2) | Feedback input referenced to 1.22V | Sets regulated output voltage; high-impedance node (bias current ≤100nA); requires short trace routing. |
| SHDN (Pin 3) | Enable/disable control input | Pull to GND to disable; tie to VIN (or >VIN) to enable; floating state causes erratic behavior. |
| GND (Pin 4) | Power and signal reference ground | Must connect directly to local ground plane; shared return for SW, LBI, and LBO paths. |
| SW (Pin 5) | Switch node connecting to inductor/diode | High dv/dt node; minimize trace area and length to reduce EMI and switching losses. |
| VIN (Pin 6) | Main power input (1V–5V) | Requires 1µF ceramic bypass capacitor placed <5mm away; bulk capacitance supplied by battery. |
| LBI (Pin 7) | Low-battery detector input | Accepts 0–700mV; 200mV threshold with ±14mV tolerance; bias current flows out (5–30nA). |
| LBO (Pin 8) | Low-battery detector open-collector output | Sinks up to 10µA; requires external 1MΩ pull-up to VIN or logic rail for active-low flag generation. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous 600kHz switching | Eliminates low-frequency Burst Mode ripple present in LT1307, enabling use in noise-sensitive analog/RF sections. |
| 1V minimum input operation | Supports full regulation down to end-of-life single-cell battery voltage (0.92V start), extending runtime in portable equipment. |
| Integrated 200mV low-battery detector | Provides system-level battery monitoring without external comparators or references; LBO output drives standard logic inputs. |
| Internal 500mA NPN power switch | Reduces BOM count and layout complexity; VCESAT ≤350mV ensures <175mW conduction loss at 500mA. |
| MSOP-8 package with thermal pad | Enables high-density placement in compact handheld devices; exposed pad improves thermal resistance (θJA = 120°C/W). |
Applications
| Glucose Meters | GPS Receivers |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration with LCD display and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary 3.3V system rail generator from single AA/AAA cell; powers microcontroller, sensor interface, and RF transceiver. Use Value: Continuous 600kHz operation prevents Burst Mode ripple from coupling into sensitive analog front-end or RF receiver band (1.575GHz). |
Use Scenario: Portable navigation unit with cold-start GPS acquisition requiring fast wake-up and stable VCC under varying battery voltage. IC Role / Device Role / Timing Role: Boost converter supplying 3.3V to GPS baseband IC and crystal oscillator; maintains regulation during battery sag below 1.1V. Use Value: 1V start capability and 1mA IQ ensure reliable operation through full battery discharge curve without brownout resets. |
| Cordless Telephones | Diagnostic Medical Instrumentation |
Use Scenario: DECT cordless handset with backlight, speaker, microphone, and digital signal processor operating from two NiMH cells in series. IC Role / Device Role / Timing Role: Generates clean 3.3V rail for DSP and audio codec; LBO signals battery replacement need to host MCU. Use Value: LBI/LBO integration replaces discrete voltage monitor, reducing component count while providing accurate 200mV threshold detection. |
Use Scenario: Portable ECG monitor with analog front-end, ADC, and wireless telemetry running on single lithium coin cell. IC Role / Device Role / Timing Role: Supplies regulated 3.3V to precision analog circuitry and low-power BLE SoC; operates continuously at 10–50mA loads. Use Value: Absence of Burst Mode eliminates sub-audio ripple that could alias into ECG bandwidth (0.05–150Hz), preserving diagnostic accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307CMS8#TRPBF | Includes Burst Mode operation; 50µA quiescent current vs. 1mA; same pinout and package. | Higher light-load efficiency but introduces 5–50kHz low-frequency output ripple. | Select LT1307CMS8#TRPBF only when ultra-low IQ is critical and ripple can be filtered; avoid in analog-signal-path applications. |
| TPS61200DRCT | Fixed 1.2MHz switching; 5.5µA IQ in shutdown; integrated 1.5A switch; requires external compensation. | Better efficiency above 50mA; smaller inductors possible; lacks integrated low-battery detector. | Choose TPS61200DRCT for higher output current (>100mA) or tighter board space; add discrete LBI circuit if battery monitoring needed. |
Compared with LT1307CMS8#TRPBF, the LT1307BCMS8#TRPBF trades 20× higher quiescent current for ripple-free output, while versus TPS61200DRCT it offers integrated battery monitoring and lower EMI at 600kHz-but with lower peak current capability.
Availability
LT1307BCMS8#TRPBF is available at Aetrix Electronics and suitable for glucose meters, GPS receivers, and diagnostic medical instrumentation requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing for FDA-regulated designs.
Supply support for LT1307BCMS8#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1307 family.
The LT1307B series was designed specifically for single-cell micropower boost applications where continuous switching and low-noise output are prioritized over minimal quiescent current-targeting portable medical, instrumentation, and communications equipment.
FAQ
What is the minimum input voltage required for LT1307BCMS8#TRPBF to start regulation?
The LT1307BCMS8#TRPBF starts regulation at 0.92V (–40°C) to 1.0V (25°C) and maintains operation down to 1V across its full industrial temperature range (–40°C to 85°C). This enables reliable startup from deeply discharged single-cell alkaline or NiMH batteries, a key requirement for long-runtime portable devices. The LT1307BCMS8#TRPBF achieves this with optimized bandgap and reference circuitry that remains functional below typical 1.1V thresholds.
How does LT1307BCMS8#TRPBF differ from LT1307CMS8#TRPBF in terms of output ripple performance?
The LT1307BCMS8#TRPBF eliminates Burst Mode operation entirely, ensuring continuous 600kHz switching regardless of load-resulting in no low-frequency (5–50kHz) output ripple. In contrast, the LT1307CMS8#TRPBF enters Burst Mode below ~100mA, generating large-amplitude, variable-frequency ripple that complicates filtering. This makes the LT1307BCMS8#TRPBF preferable in analog-signal-path or RF-sensitive applications where spectral purity is critical.
Can LT1307BCMS8#TRPBF drive a 5V output from a 1.25V input, and what efficiency can be expected?
Yes, the LT1307BCMS8#TRPBF can generate 5V from 1.25V input using appropriate feedback resistors (R1 = 1MΩ, R2 = 329kΩ per datasheet Figure 1). At 5mA load, typical efficiency is ~75%; at 20mA, it rises to ~85%, and peaks near 88% at ~50mA. Efficiency drops at very light loads due to fixed 1mA quiescent current, but remains stable across the 10mA–100mA range essential for portable instrumentation.
What external components are mandatory for stable operation of LT1307BCMS8#TRPBF?
Mandatory components for LT1307BCMS8#TRPBF include: (1) 1µF ceramic input capacitor placed within 5mm of VIN and GND pins; (2) 10µF ceramic output capacitor; (3) 10µH inductor rated for ≥500mA DC current and low core loss at 600kHz; (4) Schottky diode (e.g., MBR0520L); and (5) VC compensation network (e.g., 100kΩ + 680pF). Omitting any of these risks instability, poor regulation, or excessive EMI.
How is the low-battery detection function implemented in LT1307BCMS8#TRPBF?
The LT1307BCMS8#TRPBF implements low-battery detection via dedicated LBI (input) and LBO (open-collector output) pins. A precision 200mV internal reference compares against the voltage applied to LBI; when LBI falls below 186–210mV, LBO pulls low (≤0.25V @ 10µA sink). No external components are needed beyond a 1MΩ pull-up resistor on LBO. This integrated function replaces discrete voltage monitors in space-constrained designs.
LT1307BCMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 30V (Switch)
- Current - Output:
- 600mA (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1307BCMS8#TRPBF FAQ
1.How can I place an order for LT1307BCMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1307BCMS8#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1307BCMS8#TRPBF reliable?
The price and inventory of LT1307BCMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1307BCMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1307BCMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1307BCMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1307BCMS8#TRPBF?
LT1307BCMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1307BCMS8#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1307BCMS8#TRPBF?
For technical support, including LT1307BCMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1307BCMS8#TRPBF requirements.
6.How does Aetrix verify that LT1307BCMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1307BCMS8#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1307BCMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1307BCMS8#TRPBF?
All LT1307BCMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1307BCMS8#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1307BCMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1307BCMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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